Sewing machine



(No Model.) v 2 Sheets-8heet 1.

I W. F. DIAL.

SEWING MACHINE. No. 547,632; Patented 0011.8,1895.

llll-llllll (No Model 2 SheetS-Shet 2.

. W P DIAL SEWING- MACHINE.

No. 547,632. Patented 0013.8,1895.

Mrs TATES ATENT Prion.

WILBUR F. DIAL, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE IVHEELER &WILSON MANUFACTURING COMPANY, OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters latent No. 547,632, dated October8,1895.

Application filed May 8,1894, Serial No. 510,470. (No model.)

To aZZ whom it may concerm Be it known that I, WILBUR F. DIAL, ofBridgeport, county of Fairfield, State of Connecticut, have invented anImprovement in Sewing-Machines, of which the following description, inconnection with the accompanying drawings, is a specification, likeletters and figures on the drawings representing like parts.

In the use of a sewing-machine by an operator, the work has frequentlyto be removed from under the presser-foot, and it is customary for theoperator to lift the presser-foot, then breakoff the'thread, and pullthework out from under the foot. Operators are instructed to see thatthe take-up is at its highest point when the work is removed; butfrequently this feature is overlooked, and as a result when the machineis started and not enough thread has been drawn through the tensiondevice and needle-eye the take-up unthreads the needle. To obviate thistrouble and avoid the waste of time of the operator, as well as tolessen the care in running the machine, I have devised'and combined withthe stitch-forming mechanism an auxiliary independent shaftturningdevice, whereby when the machine has come to rest and the work is to beremoved, the said shaft, and with it the take-up actuating mechanism,'may be moved sufficiently to put the take-up in substantially itshighest position, said auxiliary moving device being inactive during theoperation of sewing and being active only after the machine has beenstopped and between the time the machine is stopped and is again to bestarted for stitching, my device not in any way controlling or measuringthe throw of the take-up according to the thickness of the materialunder the presser-foot.

In the mannerin which I have herein chosen to illustrate my invention inthis particular I have made the usual presser-foot lifter as theactuating device for the means employed to move the take-up-actuatingmechanism, that being a simple form of my invention.

Figure 1 in side elevation, partially broken out, shows a sewing-machineof well-known construction with my improvements added; Fig. 2, a frontend elevation with the capplate removed, the take-up being down. Fig.

3 shows the same parts above the bed-plate, but in a different position;Fig. 4, a partial section at one side of the presser-bar. Figs. 5 and 6show a modification, and Fig. 7 shows the lever a detached.

The framework A, having the rotatable needle-actuatingshaftA',providedatits front end with a hub or plate having a crank-pin a, connected bylinkb to a projection on a block connected with the needle-bar b andhaving a cam-groove b in its periphery to receive the rolleror otherstud b of the take-up b pivoted at 19 the presser-bar C, having thepresser-foot c, the connection (1, joined at its upper end to a crank onthe needle-bar-actuating shaft and sliding on a fulcrum d and having atits lower end a crank-pin d to enter a slot in an arm (i attached to theloop-taker shaft 01 said shaft having imparted to it by said connectiona variable rotary motion, a loop-taker d connected to said shaft, andthe bobbinholder d having a cross-bar d and held in position by a screwd connected to a portion of the framework, and the latch 01* to keep thebobbin-holder in place, and the tension device t are and may be all ascommon in the Wheeler & Wilson machine, style No. 9, except as to thelink 1), which is somewhat differently shaped along one edge.

I have provided the presser-bar C (see Figs. 2 to 4:)or a part moving inunison therewith with an actuator e, which when elevated acts against alever 'or auxiliary independent shaft-moving device 6', represented aspivoted at c and normally held down by a spring c, said lever having aprojection 3 and being shown as located between the usual needle-bar andthe link b referred to for actuating the same, said link being slightlychanged, however, in shape so as to enable said projection, when thelever is operated as will be described, to slide freely upwardly alongand off over the top of the link into the position shown by dottedlines, Fig. 3, which it could not do if the link were of usual shapethat is, if its end having the hole for the reception of the stud ctwere nearly circular and of greater diameter than the width of the link.

In Figs. 1 to 3, where the point of the needleis represented as abovethe work-plate or throat, it will be seen that when thepresserbarislifted by the action of the usual presserbar lifter h thefinger h of said lifter will move the actuator e, and the latter in turnwill act against and move the lifter e, consti- 5 tuting the auxiliaryindependentshaft-mover, causing it to engage the link I), occupying aposition, it may be, substantially as in Fig.

2, or a position with the stud a at or above the center line of theshaft A, and will cause the said shaft, the machine having beenpreviously stopped, to be turned for a part of a revolution, thuscausing the take-up-actuating means, herein shown as acam and having thegroove W, to move into a position to put the take-up into substantiallyits highest position in case it had not been left in such position whenthe machine was stopped, the putting of the take-up in substantially itshighest position after the machine has been stopped and before startingit again insuring the pulling off from the usual thread supply for theneedle of a sufficient quantity of thread, so that when the machine isagain started the movement of the needle-bar and the take-up will noteifect the unthreading of the needle. This invention is not limited,however, to the particular construction shown for the lever or devicesemployed for partially rotating the shaft independently of its usual 0driving mechanism after the machine has been stopped and thus move withit the actuating means for the take-up in order that it may put. thetake-up in proper position to avoid unthreading the needle, as stated,and

5 instead I may employ any other usual or suitable devices, and it willbe readily seenthat the shape and construction of the devices maybechanged by the exercise of only the skill of the mechanic and withoutinvention, accord- 0 ing to the particular mechanism to whichmyinvention is to be applied, and this invention is not limited to theparticular shape of the take-up or to the particular shape of thetakeup-actuating means. While I prefer that the actuator, forsimplicity, be connected directly to the presser-bar, yet this inventionis not limited to mounting said actuator on the presser-bar, as,instead, the actuator (marked e Fig. 5) may have an independent guide or5o support which may be actuated by alifter g, which may be the usuallever or may be an independent lever or device suitably located for thatpurpose. In Fig. 6, showing this modification, it. will be understoodthat the lever 6 may be moved by the lever 9 even when the presser-footis down, and consequently the take-up-actuating mechanism may beliftedindependently to draw off a proper amount of thread.

This machine is not devised or intended to vary the throw of the take-upautomatically according to the thickness of the work under thepresser-foot, and it does not so work, and the independent auxiliaryshaft-moving device operates only after the machine has been brought torest with the crank-pin a at or ently of the needle-bar, and take-upactuating devices deriving movement from the needlebar actuating-shaftduring the sewing operation, combined with an auxiliary shaft-mow ingdevice to at times engage a portion of the needleactuating. mechanismand thereby turn the shaft after the machine has-ceased sewing, suchturningof the shaft eifecting an independent and supplementary movementof the take-up and causing it to pull off enough needle thread toprevent the unthreading of the needle, substantially as described.

2. In a sewing machine, the following in* strumentalities, viz;--apresser-bar; an actuator 6, means to move it; a take-up; a shaft,

a take-up actuating cam thereon, the needlebar, and link I), combinedwith the lever c to engage the link I) and effect the movement of thesaid take-up actuating mechanism to put the take-up in substantially itshighest position and thereby draw off suflicient thread to preventunthreading of the needle when beginning to sew, the thread in themeantime having been broken, substantially as described.

3. Anieedle-bar having an eye-pointedneedle, a rotating needle-baractuating shaft, a link connecting said shaft and needle-bar, a take-up,and take-up actuating devices deriving movement from said shaft duringthe sewing operation, combined with an actuator and means to raise it,an auxiliary shaft'moving device arranged between the needle-bar and theconnecting link and operated by the raising of the actuator after thesewing operation ceases, to give further movement to the shaft andthereby actuate the take-up and.

cause it to pull off enough needle thread to prevent the uuthreading ofthe needle, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILBUR F. DIAL.

Witnesses:

lsAAc HOLDEN, A. E. PORTER.

